Credit card transactions are among the activities that have been monitored by the National Security Agency as part of its effort to target possible terrorists, the Wall Street Journal reported Thursday night.

The report does not identify the credit card companies involved and says it is unclear if the monitoring of transactions is ongoing.

The news about the credit card transactions follows reports from earlier in the day that the NSA has had access to the internet servers of large technology companies, giving the agency the ability, through a program nicknamed PRISM, to track e-mails and web searches.

National Intelligence Director James Clapper defended that program late Thursday saying procedures are in place that are approved by the Foreign Intelligence Surveillance Court “to ensure that only non-U.S. persons outside the U.S. are targeted, and that minimize the acquisition, retention and dissemination of incidentally acquired information about U.S. persons.”

“Information collected under this program is among the most important and valuable intelligence information we collect, and is used to protect our nation from a wide variety of threats,” Clapper said in a statement.